Downtown, everyone had gone blind.  A blind man struggled through the narrow aisles between the bikes and dressers, the lone china cups, the wounded figurines, and the eternal mirrors at the Treasure Mart.  A blind woman emerged from an alley, tentatively tapping the arc of sidewalk immediately beyond the gap in the buildings.  A blind boy sat by the fountain, tilting his head back and forth to no particular rhythm.  A blind girl ate gracefully in the window of a café, her fingers shiny with grease.